﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Ttrs3
    {
        public static void Anull()
        {
            Boolean falg;
            Console.WriteLine("请输入：");
            string a = Console.ReadLine();
            if (a==null)
            {
                falg = true;
            }
            else if(a=="")
                {
                falg = true;
            }
            else
            {
                falg = false;
            }

            foreach (char item in a)
            {
           
                if (item==' ')
                {
                    falg = true;
                }
                else
                {
                    falg = false;
                    break;
                }
            }
        }
    }
}
